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1 | #ifndef __UINPUT_H_ |
2 | #define __UINPUT_H_ |
3 | /* |
4 | * User level driver support for input subsystem |
5 | * |
6 | * Heavily based on evdev.c by Vojtech Pavlik |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 2 of the License, or |
11 | * (at your option) any later version. |
12 | * |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | * GNU General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this program; if not, write to the Free Software |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
21 | * |
22 | * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> |
23 | * |
24 | * Changes/Revisions: |
25 | * 0.3 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>) |
26 | * - update ff support for the changes in kernel interface |
27 | * - add UINPUT_VERSION |
28 | * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) |
29 | * - added force feedback support |
30 | * - added UI_SET_PHYS |
31 | * 0.1 20/06/2002 |
32 | * - first public version |
33 | */ |
34 | |
35 | #include <linux/input.h> |
36 | |
37 | #define UINPUT_VERSION 3 |
38 | |
39 | #ifdef __KERNEL__ |
40 | #define UINPUT_MINOR 223 |
41 | #define UINPUT_NAME "uinput" |
42 | #define UINPUT_BUFFER_SIZE 16 |
43 | #define UINPUT_NUM_REQUESTS 16 |
44 | |
45 | enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; |
46 | |
47 | struct uinput_request { |
48 | int id; |
49 | int code; /* UI_FF_UPLOAD, UI_FF_ERASE */ |
50 | |
51 | int retval; |
52 | struct completion done; |
53 | |
54 | union { |
55 | int effect_id; |
56 | struct { |
57 | struct ff_effect *effect; |
58 | struct ff_effect *old; |
59 | } upload; |
60 | } u; |
61 | }; |
62 | |
63 | struct uinput_device { |
64 | struct input_dev *dev; |
65 | struct mutex mutex; |
66 | enum uinput_state state; |
67 | wait_queue_head_t waitq; |
68 | unsigned char ready; |
69 | unsigned char head; |
70 | unsigned char tail; |
71 | struct input_event buff[UINPUT_BUFFER_SIZE]; |
72 | int ff_effects_max; |
73 | |
74 | struct uinput_request *requests[UINPUT_NUM_REQUESTS]; |
75 | wait_queue_head_t requests_waitq; |
76 | spinlock_t requests_lock; |
77 | }; |
78 | #endif /* __KERNEL__ */ |
79 | |
80 | struct uinput_ff_upload { |
81 | int request_id; |
82 | int retval; |
83 | struct ff_effect effect; |
84 | struct ff_effect old; |
85 | }; |
86 | |
87 | struct uinput_ff_erase { |
88 | int request_id; |
89 | int retval; |
90 | int effect_id; |
91 | }; |
92 | |
93 | /* ioctl */ |
94 | #define UINPUT_IOCTL_BASE 'U' |
95 | #define UI_DEV_CREATE _IO(UINPUT_IOCTL_BASE, 1) |
96 | #define UI_DEV_DESTROY _IO(UINPUT_IOCTL_BASE, 2) |
97 | |
98 | #define UI_SET_EVBIT _IOW(UINPUT_IOCTL_BASE, 100, int) |
99 | #define UI_SET_KEYBIT _IOW(UINPUT_IOCTL_BASE, 101, int) |
100 | #define UI_SET_RELBIT _IOW(UINPUT_IOCTL_BASE, 102, int) |
101 | #define UI_SET_ABSBIT _IOW(UINPUT_IOCTL_BASE, 103, int) |
102 | #define UI_SET_MSCBIT _IOW(UINPUT_IOCTL_BASE, 104, int) |
103 | #define UI_SET_LEDBIT _IOW(UINPUT_IOCTL_BASE, 105, int) |
104 | #define UI_SET_SNDBIT _IOW(UINPUT_IOCTL_BASE, 106, int) |
105 | #define UI_SET_FFBIT _IOW(UINPUT_IOCTL_BASE, 107, int) |
106 | #define UI_SET_PHYS _IOW(UINPUT_IOCTL_BASE, 108, char*) |
107 | #define UI_SET_SWBIT _IOW(UINPUT_IOCTL_BASE, 109, int) |
108 | |
109 | #define UI_BEGIN_FF_UPLOAD _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload) |
110 | #define UI_END_FF_UPLOAD _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload) |
111 | #define UI_BEGIN_FF_ERASE _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase) |
112 | #define UI_END_FF_ERASE _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase) |
113 | |
114 | /* |
115 | * To write a force-feedback-capable driver, the upload_effect |
116 | * and erase_effect callbacks in input_dev must be implemented. |
117 | * The uinput driver will generate a fake input event when one of |
118 | * these callbacks are invoked. The userspace code then uses |
119 | * ioctls to retrieve additional parameters and send the return code. |
120 | * The callback blocks until this return code is sent. |
121 | * |
122 | * The described callback mechanism is only used if ff_effects_max |
123 | * is set. |
124 | * |
125 | * To implement upload_effect(): |
126 | * 1. Wait for an event with type == EV_UINPUT and code == UI_FF_UPLOAD. |
127 | * A request ID will be given in 'value'. |
128 | * 2. Allocate a uinput_ff_upload struct, fill in request_id with |
129 | * the 'value' from the EV_UINPUT event. |
130 | * 3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the |
131 | * uinput_ff_upload struct. It will be filled in with the |
132 | * ff_effects passed to upload_effect(). |
133 | * 4. Perform the effect upload, and place a return code back into |
134 | the uinput_ff_upload struct. |
135 | * 5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the |
136 | * uinput_ff_upload_effect struct. This will complete execution |
137 | * of our upload_effect() handler. |
138 | * |
139 | * To implement erase_effect(): |
140 | * 1. Wait for an event with type == EV_UINPUT and code == UI_FF_ERASE. |
141 | * A request ID will be given in 'value'. |
142 | * 2. Allocate a uinput_ff_erase struct, fill in request_id with |
143 | * the 'value' from the EV_UINPUT event. |
144 | * 3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the |
145 | * uinput_ff_erase struct. It will be filled in with the |
146 | * effect ID passed to erase_effect(). |
147 | * 4. Perform the effect erasure, and place a return code back |
148 | * into the uinput_ff_erase struct. |
149 | * 5. Issue a UI_END_FF_ERASE ioctl, also giving it the |
150 | * uinput_ff_erase_effect struct. This will complete execution |
151 | * of our erase_effect() handler. |
152 | */ |
153 | |
154 | /* |
155 | * This is the new event type, used only by uinput. |
156 | * 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value' |
157 | * is the unique request ID. This number was picked |
158 | * arbitrarily, above EV_MAX (since the input system |
159 | * never sees it) but in the range of a 16-bit int. |
160 | */ |
161 | #define EV_UINPUT 0x0101 |
162 | #define UI_FF_UPLOAD 1 |
163 | #define UI_FF_ERASE 2 |
164 | |
165 | #define UINPUT_MAX_NAME_SIZE 80 |
166 | struct uinput_user_dev { |
167 | char name[UINPUT_MAX_NAME_SIZE]; |
168 | struct input_id id; |
169 | int ff_effects_max; |
170 | int absmax[ABS_MAX + 1]; |
171 | int absmin[ABS_MAX + 1]; |
172 | int absfuzz[ABS_MAX + 1]; |
173 | int absflat[ABS_MAX + 1]; |
174 | }; |
175 | #endif /* __UINPUT_H_ */ |
176 | |
177 |
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